JPS61143969A - Slide contact unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sliding contact device, and particularly to a combination of a brush material and a commutator or slip ring material constituting the same.

(Prior art and problems) Conventional sliding contact devices contain 20 to 70% by weight of Pd and 3% Ag.
A brush made of 0 to 80% by weight alloy material, and Ag
-Cd 065 to 15% by weight in combination with a commutator or slip ring made of an alloy material.

By the way, this sliding contact device had high adhesiveness (poor wear resistance) during sliding operation.

(Object of the Invention) The present invention has been made to eliminate these drawbacks, and aims to provide a sliding contact device that suppresses brush wear and improves the wear resistance of a commutator or slip ring. It is.

(Structure of the invention) The sliding contact device of the present invention contains 20 to 70% by weight of Pd.

A brush made of an alloy material containing 30 to 80% Ag by weight, and 0.5 to 15% by weight of Cd oxide and a total of 0.5 to 10% by weight of Si and Zr oxides in Ag in a uniform and fine manner. It is a combination of a commutator or a slip ring made of dispersed material.

In the sliding contact device of the present invention, the reason why the brush is made of the same alloy material as conventional brushes, which is 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, is to take advantage of its excellent corrosion resistance.

In addition, in the composition of the commutator or slip ring material, the reason why 0.5 to 15% by weight of Cd oxide is uniformly and finely dispersed in Ag is to increase the lubricity and improve the wear resistance of Ag. If it is less than 0.5% by weight, it has no effect, and if it exceeds 15% by weight, the contact resistance becomes high and unstable. Furthermore, the reason why the oxides of Si and Zr are uniformly and finely dispersed in a total of 0.5 to 10% by weight is to increase the softening temperature and suppress adhesion during the rubbing operation to improve wear resistance. If it is less than 5% by weight, the effect will be weak;
If it exceeds 10% by weight, processing becomes difficult.

(Example and Conventional Example) Brush wire rods made of an alloy material of 60% by weight of Pd and 40% by weight of Ag and each having a wire diameter of 0.7 m were cut into lengths of 8 fi.
These are lined up and one end is 10B wide, 13mm long, and 0.2mm thick.
A brush was made by welding it to a composite material of No. n and bending a 2R arc-shaped contact portion at the other end. On the other hand, slip rings with a diameter of 50 m were made by punching out 0.5 m thick plates made of the materials of the example (by internal oxidation method) and the conventional example having the component compositions shown in the left column of the table below. Therefore, a sliding contact device was made by combining these brushes and slip rings, each brush was brought into contact with the slip ring, and the slip ring was rotated in forward and reverse directions to conduct a friction test under the following test conditions to determine the wear of the brushes and slip rings. When the amount and contact resistance were measured, the results shown in the right column of the table below were obtained.

Test conditions Current: 0.6A Voltage: DC12V Load: Resistance load Rotation speed: 1QQQrpm Circumferential speed: 120-130 m/min Contact crab 100g Sliding time near time (below the margin) As shown in the table above As can be seen, the brushes and slip rings of the sliding contact devices of Examples 1 to 3 have less wear than the brushes and slip rings of the sliding contact devices of Conventional Examples 1 and 2, respectively, and the contact resistance is low and stable1. I understand. This is simply because the material constituting the slip ring of the sliding contact devices of Examples 1 to 3 is 1. Wear resistance is improved by the lubricating effect of Cd oxide and adhesion suppression by St and Zr oxides, and since these oxides are uniformly and finely dispersed, they do not accumulate, resulting in low and stable contact resistance. Nothing but empty.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention has less wear on the brush, commutator, or slip ring than the conventional sliding contact device, and the contact resistance is low and stable. It can be said that it can replace a sliding contact device.

Claims (1)

[Claims] A brush made of an alloy material containing 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, and 0.0% of Cd oxide in Ag.
5 to 15% by weight and a total of 0.5% of Si and Zr oxides
A sliding contact device combined with a commutator or slip ring made of a material that is uniformly and finely dispersed at ~10% by weight.